Emergency exit lock



Nov. 3, 1959 D. c. MUESSEL EMERGENCY EXIT LOCK 3 Sheets-Sheet 1 Filed July 29. 1955 ms $2 M m 5 C. M PM Nov. 3, 1959 D. c. MUESSEL EMERGENCY EXIT LOCK 5 Sheets-Sheet 2 Filed July 29, 1955 INVENTOR. Dan dMzzesseZ inulj I 7 4 x i /w 6/ 6 6.0 53 ma I FIGJI Nov. 3, 1959 D. c. MUESSEL 2,910,857

EMERGENCY EXIT LOCK Filed July 29, 1955 3 Sheets-Sheet 3 FIG. 13

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D 572 CMzzesseZ 7 5M mowed 0 United States Patent EMERGENCY EXIT LOCK Dan C. Muessel, Niles, Mich., assignor to Kawanee Company, Niles, Mich., a corporation of Delaware Application July 29, 1955, Serial No. 525,337

16 Claims. (Cl. 70-92) The present invention relates to emergency exit locks or panic devices and has for its primary object the provision of a new and improved device of this character that can be made and installed economically and which can be used on doors having narrow side rails.

A further object of the invention is the provision of a new and improved emergency exit lock or panic device having few operating parts, which can be locked in position with the locking means open and which has a simple means for operating the mechanism from the exterior which is controlled by a lock and key.

Another object of the present invention is the provision of a new and improved emergency exit lock or panic device having bolt latching means capable of bolding the bolt in any position of retraction.

In brief, the emergency exit lock or panic device of the present invention includes top and bottom bolts secured to bolt rods which are mounted for relative reciprocating movement inside a tubular door rail. The inner ends of the bolts are positioned close to each other and connected to a rocker assembly also mounted in the door rail. The rocker assembly is adapted to be rotated by a panic type of push bar mounted on pivot arms which are operatively connected to the rocker assembly and mounted for pivotal movement about pivot pins mounted in housings secured to the door rail. The top bolt has associated with it a bolt retaining pawl constructed and arranged to hold the bolt in any position of retraction. The panic device also includes structure operable from the outside of the door to unlock the door from that side. It also includes means associated with one of the moving parts for holding the bolts in retracted position whenever it is desired to render the panic de vice inoperative and to hold the door unlocked.

Other objects and advantages of the present invention will become apparent from the ensuing description in the course of which reference is bad to the accompanying drawing, in which:

Fig. 1 is a front elevational interior view on a reduced scale of a door equipped with the panic device of the present invention;

Fig. 2 is a fragmentary enlarged interior elevational view of the device;

Fig. 3 is a fragmentary enlarged exterior elevational view of the installation;

Fig. 4 is a fragmentary vertical cross sectional view of the device, the view being taken along the line 44 of Fig. 2 and illustrating primarily the operating mechanism assembly and its position when the bolts are locked or projected (in solid lines) and when the bolts are unlocked or retracted (dotted lines);

Fig. 5 is a top plan view of the upper bolt structure of the device, the view being taken along the line 5-5 of Fig. 1;

Fig. 6 is a vertical cross sectional view along the line 66 of Fig. 5;

Fig. 7 is a vertical cross sectional view along the line 7-7 of Fig. 6;

t and rail 22 is the hinge rail.

2,910,857 Patented Nov. 3, 1959- Fig. 8 is a vertical cross sectional view similar to Fig. 6 of the lower bolt structure;

Fig. 9 is a fragmentary side elevational view, partly broken away, of a modified form of construction illustrating a different means for holding the door latching bolts in unlocked position;

Fig. 10 is a fragmentary cross sectional view taken along the line 10-10 of Fig. 9;

Fig. 11 is a view similar to Fig. 4 illustrating a further modification including a different type external locking means and with the latter conditioned to prevent external operation; I

Fig. 12 is a view similar to Fig. 11 but with external locking means opened and with the external operating handle actuated to open the door bolts;

Fig. 13 is a vertical cross sectional view along the line 13-13 of Fig. 11; and

Fig. 14 is a perspective view of the sliding lock plate utilized in the embodiment of Figs. 11 to 13. r

A typical installation of the emergency exit lock or panic device of the present invention is illustrated in Fig. 1 where the panic device 10 is shown installed on a door 12 mounted in a door frame 14. The door includes the usualtop and bottom rails 16 and 18 and the vertical side rails 20 and 22, of which rail 20 is the lock rail The rails support a glass panel 24 in known manner.

The panic device lti is mounted on the side rails 20 and 22. It includes an operating push bar 26 secured at its opposite ends to the outer portions of pivot arms 28 and 30 which are mounted in similar hollow housings 32 and 34 secured to the inner walls 35 of the two side rails in suitable manner as by the screws 36. The pivot arms are pivotally movable about pivot pins 38. To reduce wear, each of the arms is provided with a nylon bushing 40 surrounding the associated pivot pin and of which only one is shown, see Fig. 4.

The panic device includes top and bottom door latching or locking bolts 42 and 44 (see Figs. 6, 7 and 8), both mounted in the lock rail 20 and both actuated through pivot arm 28 which, as shown in Fig. 4, has an inner U- shaped operating extension 46 extending into the interior of rail 20 and operatively connected, as will be described shortly, to the bolts through upper and lower bolt rods 50 and 52, respectively, both located in the hollow of rail 20. This operating extension is omitted from pivot arm 30. The operative connection between the pivot arm 28 and the bolt rods 50 and 52 includes a rocker assembly comprising a pair of spaced cross link members 54 (only one of which is shown in Fig. 4) pivotally movable about a pivot pin 56 mounted in the spaced dependent arms 58 of the pivot bracket 60 mounted at the inside of inner rail wall 35 as by the screws 62. The rocker assembly includes also the two pins 64 and 66 at the ends of the cross links, which pins are secured to the bifurcated ends of clevises 68 and 70 secured to the inner ends of the bolt rods 50 and 52, respectively. Pin 66 is operatively connected to pivot arm 28 through a roller 72 mounted on the pin and fitting into a U- shaped nylon fitting 74- mounted in operating extension 46 and which actually embraces the roller. it should perhaps be noted at this point that the pivot arm extension 46 enters the hollow of the rail 2% through a,

cut-out 76 in rail wall 20 underneath housing 32.

The top and bottom bolts 42 and 44 are in projected locking position when the operating parts, such as the pivot arms, are in the solid line position of Fig. 4. When the pivot arms are moved to the dotted line position, the top bar 50 is moved down to retract the top bolt and the bottom bar 52 is moved up to retract the lower bolt.

- These movements of the bolt rods occur as a result of the clockwise movement of the arm 28 about pivot pin 38 and the concurrent counterclockwise movement of the rocker assembly about pivot pin 56.

When the top bar 50 is moved down, it retracts the top bolt 42. Referring now to Figs. 5, 6 and 7 it will again be noted that bolt 42 is mounted in side rail 20. It is secured by a reduced diameter threaded lower portion 80 to the bolt rod 50, which is of tubular construction and internally threaded at its upper end. The top bolt is guided for vertical movement by a top bolt guide 82 'having a loop including apertured top and bottom portions 84 and 86 through which the bolt extends. The top portion is extended as indicated by reference character 88 to provide means for supporting the guide from the top side of the top rail 16 as by the securing screws 90. Proper location of the guide is achieved by use of the spacer plate 92 between extension 88 and top rail 16. The bolt has an inclined top and a flat 94 and when projected extends into an opening or the like 95 in the door frame structure 14, shown diagrammatically in Figs. and 6.

The bolts are biased into projected position by an operating spring 96 surrounding the upper end of bolt rod 50. The spring is held between upper and lower washers 98 and 100, the former of which abuts against the lower end of bolt 42 and the latter against a spring retaining angle 102 mounted inside rail 20. The horizontal leg of angle 102 is apertured at 104 for the passage of rod 50, the aperture being somewhat larger than the rod to permit some lateral movement of the rod. When the bolts are retracted by operation of the handle and pivot arm 28, the top bolt moves downward and the spring is compressed so as to project the bolts when they are freed from a bolt retaining pawl 106, the construction and operation of which will now be described in connection With Figs. 6 and 7.

The retaining pawl 106 is of novel construction in that it is arranged to hold the bolts in any position of partial retraction when the door is open, i.e. in position other than the fully closed position, thereby to insure satisfactory operation in different installations and adjustments of the door and bolts relative to the door frame. The pawl is pivotally mounted upon a pin 108 mounted in bolt guide 82. It includes a bolt dogging or retaining leg 110 (see particularly Fig. 7) having an aperture 112 through which the bolt extends with a fairly close fit. The pawl is biased by a spring 114 to move in a counter clockwise direction so that when the pawl is free to move and does move, the leg 110 frictionally engages the bolt and holds it in any position of retraction. The spring is located underneath leg 110 and encircles the bolt.

The bolts are released for projection by operating spring 96 when the door is closed. This release is effected by movement of the pawl to the position shown in Fig. 7, when the door is closed, at which time the pawl release leg 116 and particularly its horizontal extension 118, which is projectible outside of rail 2%) through opening 120 in the rail, engages the door frame structure 122 which is illustrated only diagrammatically. When the release extension engages the door jamb and moves to the position of Fig. 7 the pawl is in such position that the spring 96 is capable of projecting bolt 42 through aperture 112 with the result that both bolts are projected.

The lower bolt construction is illustrated in Fig. 8. The bolt 44 is hollow for the major portion of its length and it is telescopically mounted at the lower end of the bolt rod 52. It is biased downwardly by a spring 124 within the bolt and disposed between the lower end of the bolt and the lower end of the bolt rod 52. The bolt is retained on the rod and the extent of relative movement between the two is determined by a pin and slot connection including the slots 126, of which only one is shown, in the bolt and a through-pin 128 extending through the bolt rod and into the slots 126. The bolt is guided by a right angled bolt guide 130 provided with a bushing 132 of nylon or the like in which the bolt is movable.

In order to maintain the bolts in retracted or unlocked position when this is desired, there is provided in one of the movable parts, such asthe lower bolt rod 52, a screw bolt 134 which normally occupies an inoperative position in which it is shown in Fig. 4. The screw bolt can be moved to lock the panic device with the bolts retracted by moving it, as by a screwdriver or other suitable tool, so that its outer part projects into an opening 136 in the tubular rail. Access to the screw bolt 134 is through the opening 136 and an aligned opening 138 in the housing 32.

A modified structure for holding the bolts in retracted or unlocked position is illustrated in Figs. 9 and 10. As here illustrated, the structure includes the screw bolt 135 mounted on the pivot arm 28 so that its tapered head 137 abuts against the side of the arm so as to locate the bolt in an inoperative position. The arm 28 is thus free to move in the normal way. When it is desired to hold the bolts in retracted position, the arm 28 is depressed to align the bolt head 137 with a tapered hole 137A in the housing 32. When thus aligned, a socket wrench can be inserted through the hole into a socket 139 on the bolt head and the bolt can be backed out so as to wedge the tapered bolt head into the tapered hole, thereby securely and firmly to hold the bolts in retracted position.

The panic device can also be operated from the exterior. This operation is through an outer operating lever indicated as a whole by the reference character 140 pivotally mounted for movement about a pivot pin 142 in an external housing 144 in which is also mounted a conventional cylindrical lock 146. The housing is secured as by the screws 148 to the outer side of the rail 20.

The outer operating lever is normally locked against movement by a lock plate or cam 150 abutting against a generally triangular projection 152 at the upper end of the outer operating lever. When the lock is operated, plate 150 is turned and moved out of the path of movement of the projection 152, thereby allowing the outer lever to be turned in a clockwise direction by the pivot pin 142. When thus moved, the rocker assembly is moved by an inner extension 154 on the outer operating lever. The extension 154 is provided with a nylon wear sleeve 156 which actually engages a roller 158 mounted on cross pin 64 of the rocker assembly.

in Figs. 11 to 14, inclusive, there is disclosed a further embodiment having modified means for locking the outer operating lever against movement until the lock is opened. Referring now to the specified figures, the panic device I there illustrated is like that illustrated in Figs. 1 to 8 and like parts have been indicated by like reference numerals. The primary difference in the construction resides in the use of a slidable locking plate, indicated as a whole by reference character 160, which is movable from an upper lever locking position in which it is illustrated in Fig. 11 to a lower lever unlocking position in which it is illustrated in Fig. 12. The sliding movement is effected by a cam 162 rotatable by a key insertable into the lock cylinder 146. When a key is inserted into the lock cylinder and is rotated, the cam 162 turns in a counterclockwise direction, as viewed in Fig. 13, and moves the sliding plate 160 downwardly from the position of Fig. 11 to that of Fig. 12. In the position of Fig. 11 the outer or exterior operating lever is locked by engagement of a projection such as the head of screw 164, secured to the back side of lever 140, behind the lower transverse portion 166 of the slidable locking plate. When the sliding plate is moved downwardly to the position of Fig. 12 the transverse portion 166 is moved downwardly enough so that the screw head can be moved to the left, as viewed in Fig. 12, through an aperture 168 in the sliding plate and an opening 179 in the lower portion of the external housing 144.

The aperture 168 in the locking plate is a vertically elongated one terminating in an enlarged upper portion 172 through which the upper end of the external operating [ever 140 is adapted to pass. The upper end of the lock plate is provided with an upper arm 174 below which is located a lower transverse portion 176 which is interconnected by a vertical part 178. These parts define a slot in which the cam 162 is operatively mounted and of which parts 176 and 174 are engaged by the cam to lower and raise the plate. Stop shoulders 180 are provided at the junctions of the vertical and horizontal parts to determine the positions of the cam in its limit positions of Figs. 11 and 12. The slide plate is guided for vertical movement within an internal cavity 182 in the external housing member 144.

From the foregoing detailed description of the panic device of the present invention, it may be noted that it can be constructed and installed readily and economically and even in doors having narrow tubular frames. The opera tion is also simple. Assuming that the door is closed and the bolts projected to lock the door, all that is necessary to unlock the door from the interior is that the push bar 26 be moved from the solid line to the dotted line position, as shown in Fig. 4. This results in the counterclockwise rotation of the rocker assembly and the downward movement of the top bolt rod 50 and the upward movement of the lower bolt rod 52. As a result, the top and bottom bolts are both retracted. At the same time, the door is swung outwardly with the result that the locking pawl 106 can hold the top bolt in any position of retraction and it thus holds the bolt until the door is reclosed at which time the release extension 113 of the pawl 106 engages the door frame structure 122 to permit the spring 96 to project the bolts.

To unlock the door from the exterior, all that needs to be done is to insert the key into the lock cylinder 146 and turn it. In the first described embodiment, the turning of the key rotates the lock plate 150 to move it away from the projection 152 thereby enabling the exterior operating handle 140 to be moved about its pivot 142 to operate the door bolt. In the second described embodiment, the rotation of the key and lock cylinder effects movement of the cam 162 from the positions of Figs. 11 and 13 to that of Fig. 12, so as to move the locking plate 160 downwardly to free the screw head 164 and lever 140 for movement to operate the door bolts.

If for any reason it is desired to hold the door in open position, it can be opened as described above and either the holding screw 134 or 135 retracted so that the head projects into the associated opening 136 in the door frame or opening 137A in the housing 32.

While the present invention has been described in connection with the details of illustrative embodiment, it should be understood that the details are not intended to be limitative of the invention except as set forth in the accompanying claims.

Having thus described my invention, what I desire to secure by United States Letters Patent is:

1, An emergency exit lock for a door having a hollow door rail including, in combination, a hollow housing attached to the exterior of a wall of the door rail, a pivot pin mounted on said housing, a pivot arm pivotally supported on said pin and having an outer portion located outside said housing and an inner portion having a U- shaped extension extending into the interior of the rail, a rocker assembly support mounted inside the door rail, a rocker assembly pivotally mounted inside said rail on said support and including a pin received in said U-shaped extension whereby said assembly is movable by said arm, top and bottom bolt rods secured to an reciprocable in opposite directions by said assembly, top and bottom bolts secured to the ends of said bolt rods and retractable from a door locking to a door unlocking position upon movement of said assembly in one direction, means associated with said bolts for retaining said bolts in retracted position, means for releasing the last mentioned means upon closure of the door, and spring means for projecting said bolts.

2. An emergency exit lock for a door having a hollow door rail including, in combination, a hollow housingattached to the exterior of a wall of the door rail, a pivot pin mounted on said housing, a pivot arm pivotally supported on said pin and having an outer portion located outside said housing and an inner portion having a U- shaped extension extending into the interior of the rail, a rocker assembly support mounted inside the door rail having spaced dependent arms located centrally of the rail, a rocker assembly pivotally mounted inside said rail on said dependent arms and including a pivot pin received in said arms and oppositely spaced bolt rod actuating pins of which one is received in said U-shaped extension whereby said assembly is movable by said arm, top and bottom bolt rods secured to said rod actuating pins and reciprocable in opposite directions by said assembly, top and bottom bolts secured to the ends of said bolt rods and retractable from a door looking to a door unlocking position upon movement of said assembly in one direction, means associated with said bolts for retaining said bolts in retracted position, means for releasing the last mentioned means upon closure of the door, and spring means for projecting said bolts.

3. An emergency exit lock for a door having a hollow door rail including, in combination, a hollow housing attached to the exterior of a wall of the door rail, a pivot pin mounted on said housing, a pivot arm pivotally supported on said pin and having an outer portion located outside said housing and an inner portion extending into the interior of the door rail, a support fixedly secured internally of and to said door rail, means for securing both said support and said housing to said door rail, a rocker assembly pivotally mounted inside said rail to said support and operatively connected to said inner portion of said arm whereby said assembly is movable by said arm, and top and bottom bolts having portions extending inside the door rail and connected to and reciprocable in opposite directions by said assembly for movement from a door locking to a door unlocking position.

4. An emergency exit lock for a door having a hollow door rail including, in combination, a hollow housing attached to the exterior of a wall of the door rail, a pivot pin mounted on said housing, a pivot arm pivotally supported on said pin and having an outer portion located outside said housing and an inner portion having an extension extending into the interior of the door rail, a rocker assembly pivotally mounted inside said rail and comprising a link member and a pair of assembly pins carried by said members, one of said pins being operatively connected to said extension whereby said assembly is movable by said arm, top and bottom bolts having portions extending inside the door rail and connected to and reciprocable in opposite directions by said assembly for retractive movement from a door locking to a door unlocking position, and means associated with one of said bolts and operable when said door is open to retain said bolts in any position of retraction.

5. An emergency exit lock for a door having a hollow door rail including, in combination, a hollow housing attached to the exterior of a wall of the door rail, a pivot pin mounted on said housing, a pivot arm pivotally supported on said pin and having an outer portion located outside said housing and an inner portion having an extension extending into the interior of the door rail, a rocker assembly pivotally mounted inside said rail and operatively connected to said extension whereby said as sembly is movable by said arm, top and bottom bolts having portions extending inside the door rail and connected to and reciprocable in opposite directions by said assembly for retractive movement from a door locking to a door unlocking position, guide means for the top bolt in cluding a loop structure inside the door rail having spaced apertured portions for the bolt, and means including a spring biased bolt retaining pawl pivotally mounted within said loop structure and having an apertured arm c1ose- 1y receiving the bolt, said retaining pawl being operable only when said door is in an open position to cause said apertured arm to engage said bolt and hold said bolt in a'retra'cted position. I

6. An emergency exit lock for a door having a hollow 'door rail including, in combination, a hollow housing attached to'the exterior of a wall of the hollow door rail, a pivot pin mounted on said housing, a pivot arm pivotally supported on said pin and having an outer portion located outside said housing and an inner portion having an extension extending into the interior of the door rail, a rocker assembly pivotally mounted inside said rail and having spaced pins one of which is operatively connected to said extension whereby said assembly is movable in one direction by said arm, and top and bottom bolts connected to and reciprocable in opposite directions by said assembly for movement from a door looking to a door unlocking position upon said mvement of the assembly, a housing attached to the exterior of another wall of the door rail, and means including an outer operating lever pivotally mounted on said other housing and having an inner portion operatively connected to the other of said rocker assembly pins for operating said assembly to move the bolts from a door locking to a door unlocking position.

7, An emergency exit lock for a door having a hollow door rail including, in combination, a hollow housing attached to the exterior of a wall of the hollow door rail, a pivot pin mounted on said housing, a pivot arm pivotally supported on said pin and having an outer portion located outside said housing and an inner portion having an extension extending into the interior of the door rail, a rocker assembly pivotally mounted inside said rail and having spaced pins one of which is operatively connected to said extension whereby said assembly is movable in one direction by said arm, and top and bottom bolts connected to and reciprocable in opposite directions by said assembly for movement from a door locking to a door unlocking position upon said movement of the assembly, a housing attached to the exterior of another wall of the door rail, means including an outer operating lever pivotally mounted on said other housing and having an inner portion operatively connected to the other of said rocker v assembly pins for operating said assembly to move the bolts from a door locking to a door unlocking position, and means for locking said outer operating lever against movement including a lock controlled movable latch plate mounted on said other housing and a projection on said outer lever engageable by said plate.

8. An emergency exit lock for a door having a door rail including in combination, a support attached to the door rail, a pivot pin mounted on said support, a pivot arm pivotally supported on said pin and having an outer portion and an inner portion, a rocker assembly pivotally mounted on said rail and operatively connected to said inner portion whereby said assembly is movable by said arm, top and bottom bolts connected to and reciprocable in opposite directions by said assembly for retractive movement from a door locking to a door unlocking position, and means supported internally of said door rail for engagement with one of said door bolts and operable when said dooris open to retain said door bolts in any retracted position. i

9. An emergency exit lock for a door having a door rail including, in combination, a support attached to the door rail, a pivot pin mounted on said support, a pivot arm pivotally supported on said pin and having an outer portion and an inner portion, a rocker assembly pivotally mounted on said rail and operatively connected to said extension whereby said assembly is movable by said arm, top and bottom bolts connected to and reciprocable in opposite directions by said assembly for retractive movement from a door locking to a door unlocking position, means associated with said bolts and operable when said door is opened to retain said bolts in any positions of retraction, said means being releasable upon closure of the door, spring means operable upon release of said retain ing means for projecting the bolts, and means including normally inoperative locking means on a movable portion of the panic device which is operable through and movable into locking engagement with a stationary part for locking said bolts in retracted position.

10. An emergency exit lock as claimed in claim 9, wherein said normally inoperative locking means is on said pivot arm and is movable into an opening in said support, and said opening providing access to said locking means.

11. An emergency exit lock as claimed in claim 7 wherein the projection on said outer operating lever is at its upper end underneath the lock, and wherein said movable latch plate is rotatably mounted upon the lock.

12. An emerengy exit lock as claimed in claim 7 wherein said projection on the outer lever is constituted by a headed element at the backside of the lever and adapted in one position to extend within the housing attached to the exterior of the other wall of the door rail, and said movable latch plate is a vertically slidable plate having a vertically disposed elongated slot adapted in one position to permit movement of the headed element through the slot and having a transverse portion adapted in another position to engage underneath the headed element, and wherein the lock is provided with cam means for effecting vertical movement of the lock plate.

13. An emergency exit lock for a hollow door having a door rail, means including a rocker assembly movably mounted within the door rail and door locking bolts operated thereby, means for effecting movement of the rocker assembly from inside the door, and lever means for effecting movement of the rocker assembly from the outside of the door, said lever means including an inner portion for coacting with the rocker assembly and an outer portion having a headed projection at its back side, and means for preventing any movement of said lever including a lock operated vertically movable plate having a portion engageable back of said projection to prevent outward movement of the outer portion of the lever and which plate is vertically movable to disengage said portion from the projection only when said plate has been moved to its maximum unlocked position.

l4. An emergency exit lock for a door having a door rail including, in combination, a support attached to the door rail, a pivot pin mounted on said support, a pivot arm pivotally supported on said pin and having an outer portion and an inner portion, a rocker assembly pivotally mounted on said rail and operatively connected to said inner portion whereby said assembly is movable'by said arm, top and bottom bolts connected to and reciprocable in opposite directions by said assembly for retractive movement from a door locking to a door unlocking position, means supported from said door rail for engagement with one of said door bolts to retain both of said bolts when the door is opened in any retracted position corresponding to the maximum displacement of said bolts, and means for rendering said engagement means ineflec tive when said door is in its closed position.

15. An emergency exit lock for a door having a hollow door rail comprising a first operator, means for movably supporting said operator on a first side of the door, a rocker assembly, means for movably supporting said rocker assembly interiorly of the door rail, said first operator having a portion engageable with said rocker assembly, top and bottom bolts connected to and reciprocable by said rocker assembly, a second operator, means for movably supporting said second operator on a second side of the door, said second operator having a part extending internally of said door rail and including a first portion adapted to engage said rocker assembly and having a second part extending externally of said door and including a latching portion, and a lock controlled latch plate slidably supported from said door rail for em gaging in one of its positions said operator latching portion to lock said second operator against movement.

16. The emergency exit lock of claim 15 wherein said operator latching portion includes a projection having a head and a neck and said latch plate includes a slot defining means for engaging said headed projection in one position of the latch plate and for permitting movement of said headed projection through said latch plate in another position of the latch plate.

389,704 Holland Sept. 18, 1888 10 Flowers Jan. 9, Carroll June 26, Prinzler July 16, Yoe May 28,

FOREIGN PATENTS Germany Aug. 3, Great Britain Apr. 10, Great Britain Sept. 10,

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 2,910,857 November '5, 1959 Dan 0.1 Muessel It is hereby certified that error appoars in the above numbored patent reqgliring corroction (and that the said Letters Patent should read as v corrected below.

In the grant, lines 2 and 12, and in the heading to the printed. specification, lines 3 and A, name; of asaignee for Kawane'o Comperg read w Kawneer Gompan in the printed. speoifioation, column '7, line 1 for *mvement read movemen column 8, line 17 for emerengy read w emergency line 29, vstri'lse' out hollow ami insert the same before door in line 36, same column 8,

Signed and sealed this 26th day of April 1960;

(SEAL) Attest:

KARL

H'IQUJINE. ROBERT c. WATSON Attestmg Officer Comissioner of Patents 

